how novel

In looking to annotate my bibliography I was studying the amazon.com information about a book. I noticed they have added a few features to their meta data about each book. There is as matrix of words scaled in size by how often they appear in the book. Also, various scores for readibility versus education, words per sentence, word complexity, and lastly some counted information about the book. Some information must have long been available, but now it's viewable. This must also mean that the text version is in their database and is being computed by some algarythm. It's not available for all books, but it's certainly worth a look.

Amazon.com link to Media Effects: Advances in Theory and Research